A Thermoelectric Energy Harvesting System Assisted by A Piezoelectric Transducer Achieving 10-mV Cold-Startup and 82.7% Peak Efficiency

Tianqi Lu, Ruizhi Wang, Zhong Tang, Yiwei Zou, Xinling Yue, Yansong Liang, Haoran Gong, Shurui Liu, Zhiyuan Chen, Xun Liu, Junmin Jiang, Bo Zhao, Sijun Du*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

Abstract

This article presents a 10mV-startup-voltage thermoelectric energy harvesting system, assisted by a piezoelectric generator (PEG) as a cold starter. It exploits the fact that when a thermoelectric energy harvesting system is implemented in a place where kinetic energy is also present, the PEG starter can provide a clock signal to start the system. Thanks to the high output impedance of the PEG, the generated clock voltage can easily go over several hundreds of mV, which can be used to drive the boost converter to harvest thermoelectric energy even at an extremely low thermoelectric generator (TEG) voltage. The proposed system was fabricated in a 180-nm BCD process. The measurement results show that the TEG system can start up from the cold state with a TEG voltage as low as 10 mV while maintaining a 63.9% efficiency. The peak power conversion efficiency reaches 83.7% when the TEG voltage is 55 mV.
Original languageEnglish
Number of pages13
JournalIEEE Transactions on Power Electronics
DOIs
Publication statusAccepted/In press - 2024

Keywords

  • Thermoelectric energy harvesting
  • piezoelectric generator (PEG)
  • thermoelectric energy generator (TEG)
  • DC-DC converter
  • boost converter
  • cold-startup
  • maximum power point tracking (MPPT)

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